CN103956712B - Grounding distance protection solution method adaptive to overload state - Google Patents
Grounding distance protection solution method adaptive to overload state Download PDFInfo
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- CN103956712B CN103956712B CN201310717818.0A CN201310717818A CN103956712B CN 103956712 B CN103956712 B CN 103956712B CN 201310717818 A CN201310717818 A CN 201310717818A CN 103956712 B CN103956712 B CN 103956712B
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- distance protection
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- 238000000034 method Methods 0.000 title claims abstract description 6
- 230000003044 adaptive effect Effects 0.000 title abstract 2
- 238000009434 installation Methods 0.000 claims description 18
- 238000005259 measurement Methods 0.000 claims description 4
- 230000006978 adaptation Effects 0.000 claims description 2
- 240000002853 Nelumbo nucifera Species 0.000 claims 1
- 235000006508 Nelumbo nucifera Nutrition 0.000 claims 1
- 235000006510 Nelumbo pentapetala Nutrition 0.000 claims 1
- 238000002847 impedance measurement Methods 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
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Abstract
The invention discloses a grounding distance protection solution method adaptive to an overload state. The solution method includes: according to impedance measurement ranges of distance relays under an overload condition, constructing load restriction relays which do not act under an overload condition and satisfy an action condition under a grounding fault condition; through a ratio relation of a zero-sequence current and a positive-sequence current, adjusting the action ranges of the load restriction relays so as to realize characteristic dynamic adjustment in different overload degrees; and allowing grounding distance relays of corresponding phases to be used only when the load restriction relays act so as to prevent incorrect actions of the grounding distance relays under an overload condition.
Description
Technical field
The present invention relates to a kind of Protection Technology in field of power, more particularly to a kind of adaptation overload state
Ground distance protection solution.
Background technology
Exchange interconnection and the transmission capacity of raising supertension line due to bulk power grid, on the section of Power System Interconnection, just
Transmitted power often during operation on interconnection is just very high, even oepration at full load, if it is existing now to break down on circuit
As, correct operation tripping faulty line is protected, redistributing for the power on circuit can be caused, so will result in All other routes
On power conveying further increase, occur accident overload phenomenon on these circuits.Overload is carried for standby distance
Go out very high requirement, if relay protection incorrect operation in overload, it will cause the chain reactions such as the big transfer of trend,
Then it is likely to result in system crash.
It is main by increasing currently for the incorrect operation problem that distance protection is likely to occur in heavy load situations
The mode of " load limit line ", the measurement resistance value under Overload is limited in outside the active region of distancing element, typical case
Load limit line in impedance plane characteristic as shown in Figure 1.Can be seen that due to not being fitted completely from the solution
The track that impedance is measured under load condition is interval, and the load limit line is arranged on while solving the problems, such as overload for standby
The tolerance transition resistance ability of distancing element has large effect, while the load limit measure can not be carried out with overload degree
Automatically adjust, adaptability is relatively low.
The content of the invention
To solve the problems, such as impact of the overload for distance protection, the present invention proposes a kind of overload state that adapts to and is grounded
Distance protection solution, for earthing distance relay increases load limit relay.
The present invention is adopted the technical scheme that：
In distance protection, the earthing distance relay of three reaction single-phase faults is generally comprised
For above three relay, by corresponding increase load limit relay, only when the load limit relay of correspondence phase meets
When, corresponding earthing distance relay just allows input.
The load limit relay is formed as follows.
Operating criterion 1 is as follows：
Formula（1）
In formula：
To protect installation place phase voltage vector；
To protect installation place phase current vector；
To protect installation place zero-sequence current vector；
K is distance protection zero-utility theory definite value；
Corresponding A, B, C tri- are separate.
Wherein, the R in above formula is adjusted according to overladen degree, to realize Overload under load limit scope
It is variable, the concrete regulative mode of R values is as follows：
Formula（2）
In formula：
I0To protect installation place zero-sequence current virtual value；
I1To protect installation place forward-order current virtual value；
RsetIt is to adjust according to minimum measurement resistance value in the case of circuit overload, the value is in protective relaying device
Item is available for the value adjusted.
Operating criterion 2 is as follows：
ORFormula（3）
In above formula：
WithDefinition and formula（1）It is identical.
Formula（3）In arbitrary inequality meet, then operating criterion 2 meets.
Corresponding to A, B, C three-phase, can be calculated by said method and form three operating criterions 1 and three operating criterions 2, when same
When the operating criterion 1 and operating criterion 2 of one phase are satisfied by, correspondence phase load limits actuating of relay condition and meets, it is allowed to put into
Correspondence phase earthing distance relay.
In impedance plane feature as shown in Figure 2, in Fig. 2, circle is the resistance of representative ground distance relay to the load limiting device
Anti- planar gesture characteristic；Dash area is the ungratified region of load limit relay；R is according to zero-sequence current and forward-order current
The coefficient of proportionate relationship real-time adjustment.The characteristic of the load limit relay is protected as far as possible while overload state is taken into account
The ability that distance relay tolerates transition resistance is demonstrate,proved, while operating criterion 1 can limit model according to payload real-time regulation
Enclose.
The invention has the beneficial effects as follows：The area that impedance enters distancing element is measured during by being more really fitted overload
Domain, constructs the motion characteristic of more rational load limit line, improves action of the distance relay under Overload
Performance.
Description of the drawings
Fig. 1 is the acting characteristic that the typical load of current application limits relay；
Fig. 2 is load limit relay impedance plane acting characteristic schematic diagram of the present invention；
Fig. 3 is load limit actuating of relay logic chart of the present invention.
Specific embodiment
Technical scheme is described in further details below according to Figure of description.
To the three-phase voltage of protection installation place that collects and three-phase current after filtering, the measure such as Fourier transformation carries out
Process, form this programme and calculate required phase voltage, phase current vector, zero-sequence current vector and positive sequence, zero-sequence current virtual value.
Load limit relay is formed as follows.
Wherein, operating criterion 1 is as follows：
Formula（4）
In formula：
To protect installation place phase voltage vector；
To protect installation place phase current vector；
To protect installation place zero-sequence current vector；
K is distance protection zero-utility theory definite value；
Corresponding A, B, C tri- are separate.
Wherein, the R in above formula is adjusted according to overladen degree, to realize Overload under load limit scope
It is variable, the concrete regulative mode of R values is as follows：
Formula（5）
In formula：
I0To protect installation place zero-sequence current virtual value；
I1To protect installation place forward-order current virtual value；
RsetIt is to adjust according to minimum measurement resistance value in the case of circuit overload, the value is in protective relaying device
Item is available for the value adjusted.
Operating criterion 2 is as follows：
ORFormula（6）
In above formula：
WithDefinition and formula（1）It is identical.
According to the logical schematic shown in accompanying drawing 3, the action logic that correspondence phase load limits relay is formed：Formula（4）It is full
Foot, and formula（6）In arbitrary inequality when meeting, the operation condition of load limit relay meets, it is allowed to the ground connection of correspondence phase away from
Gas-discharge relay puts into.
Claims (5)
1. it is a kind of to adapt to overload state ground distance protection solution, it is characterised in that methods described includes：According to bearing excessively
Distancing element measures the scope of impedance during lotus, the load limit relay with distancing element matching is built, by load impedance
It is limited in outside distancing element active region；According to zero-sequence current and forward-order current ratio situation, overload degree is recognized, this is compared
Example coefficient is incorporated in load limit actuating of relay criterion, real-time regulation load limit actuating of relay characteristic.
2. one kind according to claim 1 adapts to overload state ground distance protection solution, it is characterised in that：Structure
The operating criterion 1 for building load limit relay is：
Wherein：
To protect installation place phase voltage vector；
To protect installation place phase current vector；
To protect installation place zero-sequence current vector；
K is distance protection zero-utility theory definite value；
R is adjust automatically coefficient；
Corresponding A, B, C tri- are separate.
3. one kind according to claim 2 adapts to overload state ground distance protection solution, it is characterised in that：Draw
Enter the proportionate relationship of zero forward-order current, real-time regulation load limit actuating of relay characteristic, adjust automatically coefficients R shape as the following formula
Into：
Wherein：
I0To protect installation place zero-sequence current virtual value；
I1To protect installation place forward-order current virtual value；
RsetIt is to adjust according to minimum measurement resistance value in the case of circuit overload.
4. one kind according to claim 1 and 2 adapts to overload state ground distance protection solution, and its feature exists
In：Build load limit relay operating criterion 2 be：
Wherein：
To protect installation place phase voltage vector；
To protect installation place phase current vector；
When in above-mentioned two inequality it is arbitrary meet when, operating criterion 2 meets.
5. a kind of adaptation overload state ground distance protection solution according to claim 4, is characterized in that：When dynamic
Make criterion 1 and when operating criterion 2 is satisfied by, load limit relay meets operation condition, and otherwise, load limit relay is discontented with
Foot, the earthing distance relay of correspondence phase is not opened.
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| CN201310717818.0A CN103956712B (en) | 2013-12-23 | 2013-12-23 | Grounding distance protection solution method adaptive to overload state |
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| CN103956712B true CN103956712B (en) | 2017-04-12 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104659761B (en) * | 2014-10-06 | 2018-05-22 | 华北电力大学（保定） | The method for preventing the protection of III of Distance section from making by overload mis-operation |
| CN104253422B (en) * | 2014-10-17 | 2016-11-23 | 国家电网公司 | A kind of distance protection overload property verification method based on real-timedigital simulation |
| CN104635085A (en) * | 2015-02-04 | 2015-05-20 | 南京南瑞继保电气有限公司 | Method for distinguishing load from fault |
| CN105514956A (en) * | 2016-01-25 | 2016-04-20 | 国网山东省电力公司青岛供电公司 | Ground distance relay and action method and device |
| CN105514955A (en) * | 2016-01-25 | 2016-04-20 | 国网山东省电力公司青岛供电公司 | Distance relay for reflecting single-phase ground short circuit and movement method and device |
| CN110646687B (en) * | 2019-09-05 | 2022-02-08 | 深圳供电局有限公司 | Distance protection setting value field calibration system and method for power grid transmission line |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710696A (en) * | 2009-12-03 | 2010-05-19 | 华中电网有限公司 | Method for solving line-protection false tripping when overloading |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710696A (en) * | 2009-12-03 | 2010-05-19 | 华中电网有限公司 | Method for solving line-protection false tripping when overloading |
Non-Patent Citations (2)
| Title |
|---|
| 线路距离保护应对事故过负荷的策略;柳焕章等;《中国电机工程学报》;20110905;第31卷(第25期);112-117 * |
| 防止过负荷时相间距离III段保护误动的新方法;朱晓彤等;《电力***保护与控制》;20110501;第39卷(第9期);7-11 * |
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